Abstract

FERRACUTTI, Gabriela; KOSTADINOFF, José  and  BJERG, Ernesto. Geophysical study the northern sector ofSierra de San Luis and Ulapes: Las Minas, province of La Rioja. Rev. Asoc. Geol. Argent. [online]. 2009, vol.64, n.4, pp.685-691. ISSN 0004-4822.

A 60 km long N-NE alignment of relativepositive Bouguer gravimetric anomalies (mass excess) has been recognizedbetween the locality San Francisco del Monte de Oro in San Luis Province and the northern part of Sierra of Ulapes- Las Minas in La Rioja Province. In this belt the magnetic anomalies havemagnitude similar to those measured on the amphibolite outcrops in the Sierrade Socoscora. Another gravimetric maximum appear between Villa General Roca andSierra de Las Minas, which display weak magnetic anomalies (almost cero) inagreement with the magnetic susceptibility values obtained on granites, milonitesand gneissic outcrops from Sierras of Las Minas, Ulapes and Socoscora. There isan excellent correlationship between the relative positive Bouguer gravimetricanomaly in the NE of Ulapes locality and a known (Devonic?) structure withassociated hydrothermal alteration.

Keywords : Geophysics; Gravimetric; Anomalies; Magnetometric; Sierras Pampeanas; Argentina.

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